the hubble tension
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The Hubble constant is a number we use to quantify the rate of expansion of the universe. The Hubble tension refers to the fact that when we use 2 different methods to measure this rate of expansion, we keep getting 2 different results that don’t match up. They both can’t be correct, but we don’t know why we’re getting 2 different answers. Over the years, these 2 numbers have diverged from each other even more as our measurements have gotten more precise. So we have 2 really good measurement methods with precise numbers that don’t match.
One possibility is that there’s some systematic error in one of our measurement methods that’s throwing off the results for that method. It’s also possible that there’s some aspect of cosmology at play that we don’t understand, which would mean we’re missing something in our laws of physics somewhere.
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